Examples:

• I can't learn this bayonet business. I'm all thumbs.
• My Mother Was All Thumbs.
• Well, enough to know that I'm all thumbs.
• When it comes to sewing, I'm all thumbs.
• I would do it myself, but I am all thumbs.
• Lucky for you, my father was all thumbs.
• I'm all thumbs in the kitchen.
• Sorry, I'm all thumbs today.
• Unfortunately, you're all thumbs as well. Suction.
• Yeah, I was all thumbs, buddy.